| Site Technology Qatar | Conglomerates |
| Sixty Degrees | Services |
| Sketch Consulting Engineering | Construction |
| SMEC International Pty Ltd | Services |
| SMEET W.L.L. | Industrial Manufacturing |
| Smile Hyper Market | Retail |
| Snow Comms Conceptual Communications & Events | Media |
| Solar Qatar Contracting Company | Construction |
| Solar Qatar Contracting WLL | Construction |
| SOLARLINE TRADING WLL | Conglomerates |
| Solid General Construction Qatar | Construction |
| Sonata Software Ltd | Information Technology |
| Sora Marine Services Co Ltd | Conglomerates |
| SOSCO W.L.L. | Industrial Manufacturing |
| Sound on Wheels | Telecommunications |
| source supply logistics | Industrial Manufacturing |
| South West Architecture | Construction |
| Special Projects Services Company W.L.L. | Industrial Manufacturing |
| Specialized Aluminium and Steel Company | Conglomerates |
| Specialized Filters & Trading Co WLL | Conglomerates |
| Specialized Professional Contractors | Industrial Manufacturing |
| Specialized Trading & Filters | Construction |
| Spectra Arts Company LLC | Industrial Manufacturing |
| Speed Line Printing Press | Media |
| Speed Marine EST Qatar | Services |
